US2137254A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dust collector
Assignee: American Foundry Equipment Co
•
Filing: 1936-03-03
•
Granted: 1938-11-22
•
Expires: 1956-03-03
Abstract
No abstract record available.
Inventors
- 👤 David C Turnbull
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:22
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/02; B01D46/04; B01D46/0002; B01D46/0004; B01D46/0005; B01D46/66; B01D46/74; B01D46/76
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1941-11-21 | 1942-05-23 | 1942-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1945-11-21 | 1946-05-23 | 1946-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1949-11-21 | 1950-05-23 | 1950-11-22 | $7700.00 | Window Closed / Lapsed |